Simplify code.  NFC.

llvm-svn: 248610
diff --git a/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp b/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
index bba8f51..7eac7ce 100644
--- a/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
+++ b/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
@@ -224,12 +224,7 @@
   if (Reg == 0)
     return false;
 
-  MachineOperand *Op = nullptr;
-  if (MO.isDef())
-    Op = MI->findRegisterUseOperand(Reg, true);
-  else
-    Op = MI->findRegisterDefOperand(Reg);
-
+  MachineOperand *Op = MI->findRegisterUseOperand(Reg, /*isKill=*/MO.isDef());
   return(Op && Op->isImplicit());
 }